M.Sc

You can refer to the eligibility page of JSS medical college through the following website: https://www.shiksha.com/college/jss-medical-college-mysore-58409/admission

You can refer to the admissions page of CMI and the link is: https://www.shiksha.com/university/chennai-mathematical-institute-cmi-2449/admission

No we can't provide you this type of Certificate.

Yes you are eligible and you can apply for professional level if you have 8 years of experience.

You can go with medical also in M.Sc. It will be beneficial in future for you.

You can do PG in mechanical engineering from these colleges;
Durham College
George Brown College
Sheridan College
Algonquin College
Humber College
Seneca College
Centennial College of Applied Arts and Technology
Confederation College of Applied Arts and Technology.

In my opinion if you pursue M.Sc from a good reputed university where placements are offered and if you have skill then you can definitely get a job in a pharmaceutical company. Currently the pharmaceutical sector is on boom.

Choose what you love. Also look at the curriculum and the university. Pursue career in microbiology only if you get admission in a good and prestigious institute. Zoology is a core subject and hence offers a wide range of career opportunities whereas microbiology is an specific course. Although there are bright opportunities in microbiology but look for some good institute.